Update geistes-und-kulturwissenschaften-teilmann.csl

- rename style to ...-heilmann.csl (not ...-teilmann.csl)
- better rendering of journal articles (show complete date)
- better rendering of thesis (show genre)
- better rendering of website (show date)
Rename geistes-und-kulturwissenschaften-teilmann.csl to geistes-und-kulturwissenschaften-heilmann.csl
Update foerster-geisteswissenschaft.csl

Changed template link because template file was renamed.
Merge pull request #882 from tillheilmann/patch-6

Update geistes-und-kulturwissenschaften-teilmann.csl